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Planographic printing plate material and planographic printing plate preparing process

a technology material, applied in the field of planographic printing plate, can solve the problems of unsatisfactory preheating latitude considering printing durability, insufficient practical properties, development failure, etc., and achieve the effects of accelerating development, high density image, and easy to increase the accuracy of an optical system

Inactive Publication Date: 2006-11-21
KONICA MINOLTA MEDICAL & GRAPHICS INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The solution provides high sensitivity, improved printing durability, enhanced storage stability, and widened preheating latitude, while reducing sludge formation, resulting in a more effective and reliable printing process.

Problems solved by technology

A composition disclosed in this patent document provides excellent sensitivity and printing durability, which is preferred, however, a planographic printing plate material comprising the composition is greatly lowered in storage stability after long term storage, resulting in insufficient practical properties.
However, when printing plate materials having a different thickness were processed, the printing plate materials are heated at preheating to different temperature due to the different thickness, producing problem of causing development failure.
However, satisfactory preheating latitude has not yet obtained considering printing durability.
Further, the above negative-working photopolymerization type printing plate material has problem in that sludge is likely to be produced in a developer, and does not have a satisfactory running property.

Method used

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  • Planographic printing plate material and planographic printing plate preparing process
  • Planographic printing plate material and planographic printing plate preparing process
  • Planographic printing plate material and planographic printing plate preparing process

Examples

Experimental program
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Effect test

example 1

[0184]Methyl methacrylate of 58.0 parts (0.58 mol), 35.0 parts (0.41 mol) of methacrylic acid, 6.0 parts (0.05 mol), of ethyl methacrylate, 100 parts of ethanol, and 1.23 parts of α,α′-azobisisobutyronitrile were put in a three neck flask under nitrogen atmosphere, and reacted under nitrogen atmosphere for 6 hours at 80° C. in an oil bath. After that, the reaction mixture was added with 1 part of triethylbenzylammonium chloride and 28.0 parts (0.2 mol) of glycidyl methacrylate (epoxy-containing unsaturated compound) and reacted at 25° C. for additional 3 hours. Thus, polymer binder A was obtained. The weight average molecular weight of the polymer binder A was 70,000, measured according to GPC.

[0185]Polymer binders B and C were prepared in the same manner as in Polymer binder A, except that a mixture ratio pf monomers, and an addition amount of the epoxy compound for reacting with the carboxyl group were changed as shown in Table 1, and polymerization time was adjusted to give a wei...

example 2

[0204]Planographic printing plate material samples No. 12 through 28 were prepared in the same manner as in Example 1, except that the polymer binder, the co-initiator and the dye were changed to those as shown in Table 3, and evaluated in the same manner as in Example 1. Herein, the following printing durability 2 was further evaluated.

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[0205]Printing was carried out except that soybean ink Naturalith 100 produced by Dainippon Ink Kagaku Kogyo Co., Ltd. was used as printing ink. The number of prints printed from the beginning of the printing till when dots at highlight image portions were reduced by 3% or filling-up was observed at shadow portions was evaluated as a measure of printing durability 2.

[0206]The results are shown in Table 3.

[0207]

TABLE 3PrintingPrintingStorage StabilityDura-Dura-PrintingCo-Sensi-bility 1bility 2DurabilityPreheat-SludgeSamplePolymeriniti-Dye 3tivity(x(xSensi-1 (xingAmountNo.Binderator(R)(μj / cm2)10,000)10,000)tivity10,000)Latitude(g)12BCI-13Octyl7077No71...

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Abstract

Disclosed is a planographic printing plate material comprising a hydrophilic support and provided thereon, a light sensitive layer and an overcoat layer in that order, wherein the light sensitive layer contains (a) an alkali soluble polymer, (b) a polymerizable compound having an ethylenically unsaturated bond, (c) a polymerization initiator, and (d) an anionic dye represented by the following formula (1),

Description

FIELD OF THE INVENTION[0001]The present invention relates to a planographic printing plate material with high sensitivity which is capable of being exposed with laser, and a process of preparing a planographic printing plate employing the same, and particularly to a planographic printing plate material capable of being exposed with low power laser, which improves storage stability and preheating latitude, and minimizes sludge, and a process of preparing a planographic printing plate employing the same.BACKGROUND OF THE INVENTION[0002]In recent years, as a printing plate for off-set printing, a large number of computer to plate (CTP) systems have been developed and put into practical use, which imagewise exposes directly to a planographic printing plate material employing laser light based on digital image data to record an image on the material. As the CTP systems, there are a silver salt system, a radical polymerization system and a thermal system, which differ in characteristics.[...

Claims

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Application Information

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Patent Type & Authority Patents(United States)
IPC IPC(8): G03F7/029G03F7/004G03F7/00G03F7/027G03F7/031G03F7/033G03F7/11
CPCG03F7/029G03F7/031
Inventor KUROKI, TAKAAKI
Owner KONICA MINOLTA MEDICAL & GRAPHICS INC
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